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Pensions and Other Postretirement Benefits - Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in plan assets:      
Other current liabilities $ (21) $ (21)  
Other liabilities (252) (279)  
Pension Benefits      
Change in benefit obligations:      
Benefit obligation at beginning of year 2,151 2,051  
Service cost 26 25 $ 40
Interest cost 107 108 67
Actuarial (gains) losses (91) 122  
Plan amendments 0 0  
Benefits paid (155) (155)  
Curtailment 0 0  
Benefit obligation at end of year 2,038 2,151 2,051
Change in plan assets:      
Fair value of plan assets at beginning of year 2,503 2,260  
Actual return on plan assets 181 375  
Employer contributions 22 23  
Benefits paid (155) (155)  
Fair value of plan assets at end of year 2,551 2,503 2,260
Funded status at end of year 513 352  
Other assets 786 652  
Other current liabilities (21) (21)  
Other liabilities (252) (279)  
Net amount recognized 513 352  
Net (gain) loss 488 574  
Prior service benefit (4) (5)  
Other Postretirement Benefits      
Change in benefit obligations:      
Benefit obligation at beginning of year 310 326  
Service cost 4 4 6
Interest cost 15 17 9
Actuarial (gains) losses (21) 1  
Plan amendments 0 (5)  
Benefits paid (32) (33)  
Curtailment 2 0  
Benefit obligation at end of year 278 310 326
Change in plan assets:      
Fair value of plan assets at beginning of year 138 122  
Actual return on plan assets 21 21  
Employer contributions 18 28  
Benefits paid (32) (33)  
Fair value of plan assets at end of year 145 138 $ 122
Funded status at end of year (133) (172)  
Other assets 0 0  
Other current liabilities 0 0  
Other liabilities (133) (172)  
Net amount recognized (133) (172)  
Net (gain) loss (56) (28)  
Prior service benefit $ (113) $ (156)